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I found that Duong's script worked great when it was updating Dell SupportAssist 3.x, but when the computers had Dell SupportAssist 1.x or 2.x installed it would simply install the new version side by side.

I updated it to include some uninstallation logic - first running through all the known uninstallers and then if that fails doing a manual removal of the old software. Then it goes into Duong's installation script to push the new version. This has fixed 99% of the problem computers I had automatically.